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Multimerin-1, also known as MMRN1, EMILIN-4 or ECM (endothelial cell multimerin), is a 1,228 amino acid secreted protein that contains one C1q domain, one EMI domain and one EGF-like domain. Synthesized in megakaryocytes and endothelial cells and present in liver, lung and placenta, Multimerin-1 exists as a multimeric structure composed of varying disulfide-linked multimers and functions as a carrier protein for platelet factors (specifically platelet factor V), playing a role in the stabilization and storage of factor V in platelets. In addition, Multimerin-1 acts as a ligand for select Integrins and may participate in extracellular matrix adhesion. Defects in the gene encoding Multimerin-1 that lead to Multimerin-1 deficiency are associated with autosomal dominant bleeding disorders due to platelet factor malfunction. Multiple isoforms of Multimerin-1 exist due to alternative splicing events.
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Protein Aliases: Elastin microfibril interface located protein 4; Elastin microfibril interfacer 4; EMILIN-4; Endothelial cell multimerin; glycoprotein Ia*; mmrn1; multimerin 1; Multimerin-1; p155
Gene Aliases: 4921530G03Rik; ECM; EMILIN4; GPIA*; MMRN; MMRN1
UniProt ID: (Human) Q13201, (Mouse) B2RPV6
Entrez Gene ID: (Human) 22915, (Rat) 500152, (Mouse) 70945
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